This is the old shaped base seat, which someone raised the question about on the forum before. I also think that it's the plunger and I think someone suggested B31. The original front bracket is very similar it's just that it has the extra two holes for mounting.

This is the old shaped base seat, which someone raised the question about on the forum before. I also think that it's the plunger and I think someone suggested B31. The original front bracket is very similar it's just that it has the extra two holes for mounting.

I had a seat just like this on a plunger B31, if you dont want it, it would go nicely on my racing sidecar!

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A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.New Zealand